Arbor



2, 1955 c. ROSENHAGEN 2,714,279

ARBOR Filed Aug. 28, 1950 I/A m 2 l K Inventor fimw lg United States Patent ARBOR Carl Rosenhagen, Dayton, Ohio Application August 28, 1950, Serial No. 181,774

6 Claims. (Cl. 51134.3)

This invention relates to an arbor installation for a lap or the like. Although not so limited, the invention has especial application to the mounting, operating and adjusting, in an arbor installation of a two-part adjustable lap as disclosed in my copending application Serial No. 412,486, filed February 25, 1954, which is a continuation of my application Serial No. 123,334, filed October 25, 1949, for Lap, now abandoned.

An object of the invention is to effect a positive driving connection from the arbor directly to each part of the lap.

Another object of the invention is to provide for simplified assembly and disassembly of the parts upon the arbor.

A further object of the invention is to provide for axial adjustments in the lap, while it is upon the arbor, to effect variations in the diameter of the lapping surface.

A further object of the invention is to embody the driving and adjustment connections in a unitary assembly which remains on the arbor during operation thereof.

A further object of the invention is to provide an arbor for a lap or the like, having the advantageous structural features and inherent meritorious characteristics and the mode of operation herein set forth.

Withthe above primary and other incidental objects in view as will more fully appear in the specification, r:

the invention intended to be protected by Letters Patent consists of the features of construction, the parts and combinations thereof, and the mode of operation, as hereinafter described or illustrated in the accompanying drawings, or their equivalents.

In the drawing, wherein is shown the preferred but obviously not necessarily the only embodiment of the invention,

Fig. 1 is a view in side elevation of an arbor assembly and lap mounted thereon;

Fig. 2 is a view in side elevation of the arbor shaft alone;

Fig. 3 is a view of the arbor shaft in end elevation;

Fig. 4 is a view in front elevation of a sliding abutment on the arbor shaft;

Fig. 5 is a view in side elevation of the sliding abutment;

Fig. 6 is a rear view of the sliding abutment;

Fig. 7 is a top plan view of the sliding abutment;

Fig. 8 is a view in cross section through the assembly comprising the sliding abutment and the adjustment member;

Fig. 9 is a view of the adjustment member in longitudinal section; and

Fig. 10 is a view, partly in longitudinal section, of the assembly comprising the sliding abutment and adjustment member, showing a modified manner of making thereof.

Like parts are indicated by similar characters of reference throughout the several views.

Referring to the drawings, in the illustrative embodiment of the invention an arbor shaft 10 presents a are reduced diameter outer end 11, the extremity of such outer end being threaded and formed with longitudinal opposed flats or lands 12. At the base of end portion 11 there is formed a shouldered abutment 13. Integral with the abutment 13 is a pair of diametrically opposed, longitudinal projections 14 having a slight radial taper and vertically undercut on respectively opposite sides to define lateral ears 15.

The abutment 13 is fixed with respect to the shaft 10. Mounted on the arbor shaft is a sliding abutment or bushing 16 having a longitudinal central opening 17 formed with oppositely disposed flats or lands 18. The lands 18 are complementary to the lands 12 on the shaft 10 so that when the bushing 16 is received on the shaft It), with the lands 12 and 13 in registry, the bushing is in eflfect keyed to the shaft. Thus bushing 16 may slide relatively to the shaft in a longitudinal direction but is constrained to rotate in unison with the shaft.

Projecting from the inner end of the sliding abutment or bushing 16 is a tongue 19. On its one side the ton ue 19 is vertically undercut the full width thereof and on its other side is undercut over only a part of its width. In effect, therefore, the tongue 19 is vertically offset and presents a relatively wide base and a narrow top portion with the front of the tongue formed as a flange 21, T-shaped on one end and L.-shaped on the other end. i

The opposite or outer end 22 of the bushing 16 is arcuate in cross section, one side thereof being removed to define a lateral opening 23. Within the arcuate shaped end portion 22 is a series of disconnected grooves 24 arranged to receive a correspondingly grooved extension 25 on an adjustment member 26. The member 26 has a longitudinal bore 27 which is threaded for engagement with the threads on the extremity of the arbor shaft. The extensionlS on member 26 is received in the end portion 22 of bushing 16 by a lateral introduction thereof through the opening 23. Following such introduction, the walls of the outer portion 22 are closed upon the extension 25 to malte of the bushing 16 and member 26 a unitary assembly. in such assembly it will be noted the bushing and member are interconnected for relative rotary motion and unison axial motion. Thus, upon turning of the member 26 along the threads of outer end 11 of the arbor shaft 10, the bushing 16 is constrained to move with the member axially to the shaft.

The lap is mounted on the arbor shaft between the fixed abutment 13 and the sliding abutment or bushing 16. Indicated generally at 23, the lap itself forms no part of the invention although its manner of coaction with and operation by the arbor assembly is deemed to be new. Of two part construction, the lap comprises a pair of cylindrical elements 29 and 30 loosely mounted on the shaft 11?. The adjacent ends of the elements 29 and 30 have tapering prongs which interfit with one another and thereby define a central lapping surface, the diameter of which can be varied by relative axial motion between the lap elements, effecting a greater or lesser penetration of the prongs of one element into complementary recesses in the other element.

The base ends of the elements 29 and 31 are formed with identical bayonet type slots 31 and 32 arranged respectively to receive the projections 14 on the fixed abutment 13 and the flange 21 on the sliding abutment 16. The end portion 22 of bushing 16 in part is comprised of deformable arms 33, which prior to assembly of the parts are positioned substantially as shown in Fig. 6. Upon receiving extension 25 of member 26 therebetween, the arms are turned over to achieve an arrangement as shown in Fig. 8 wherein a nearly continuous cylindrical bearing is provided for the shank or extension.

According to another method of assembly of the sliding abutment or bushing and the adjustment member, the former may be cast or molded directly upon the latter. Thus, as shown in Fig. 10, an adjustment member 34, corresponding to the member 26, presents an extension 35 upon which a bushing 36 corresponding to the bushing 16 has been molded. The relationship between the parts is the same, the adjustment member being capable of rotary motion relative to the bushing and the parts being connected for unison axial or sliding motion. k

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features shown, but

that the means and construction herein disclosed comprise but one of several modes of putting the invention into effect. 7

Having thus described my invention, I claim:

1. A lap and a r bor mounting" therefor, including an arbor shaft, a pair of cylindrical lap elements 'slidably and rotatably mounted on said shaft and coacting to define a lap, said elements being axially adjustable relatively to one another to vary the size of thelap, individual driving connections between said arbor shaft and said lap elements compelling unison rotation of the, lap elements with the shaft, and means longitudinally adjustable along said shaft to effect relative axial motion of said lap elements toward and from each other.

2. A lap and arbor mounting therefor, including an arbor shaft presenting an outer end of reduced diameter, a pair of cylindrical lap elements freely mounted on the outer end of said arbor shaft for movement relative thereto, said elements being axially adjustable relative to one another to vary the size of the lap, individual driving connections between said shaft and said lap elements compelling unison rotation of the lap elements with the shaft, a bushing on said shaft cooperating with the base of the reduced diameter outer end thereof to define therewith abutments at the opposite ends of said lap, and a threaded connection between said bushing and said shaft to effect a relative approaching and withdrawing motion of said abutments.

3. A lap and arbor mounting therefor, including an arbor shaft, a two-part lap slidably and rotatably mounted on said shaft, the parts of said lap being relatively movable in an axial direction to effect adjustments therein, a fixed abutment on said shaft for one end of the lap, an abutment movable to and fro on said shaft for the opposite end of the lap, a detachable connection between said fixed abutment and one part of the lap providing for unison motion of said lap part with the fixed abutment, a detachable connection between the other part of the lap and said movable abutment providing for unison to and fro motion of said other lap part with said movable abutment, a rotary driving connection between said arbor shaft and said abutments, and adjustment means in threaded engagement with said shaft and connected to said movable abutment for unison to and fro movement and relative rotary movement.

4. A lap and arbor mounting therefor, including an arbor shaft, a lap on said shaft presenting two independent coacting parts, said lap being adjusted by axial motion of said parts toward and away from one another, a detachable connection latching one of said lap parts to said shaft for unison motion therewith, an abutment mounted on said shaft for unison rotary motion J and for relative axial sliding motion, a detachable connection latching said abutment to the other lap parts for unison motion therewith, and adjustment means for effecting axial sliding motion of said abutment toward and from said first mentioned lap part.

5. An arbor assembly for mounting a two-part lap, including an arbor shaft having a reduced diameter outer end, the extremity of said outer end being threaded and the base thereof presenting a fixed shoulder abutment, a projection on said shoulder abutment for engaging one part of the lap for unison motion with said shaft, a movable abutment on said shaft keyed thereto for unison rotary and relative longitudinal movements, a

projection thereon for engaging the other part of the lap for unison motion therewith, and an adjustment member threaded on the extremity of the outer end of said shaft and connected to said movable abutment for unison longitudinal and relative rotary motions.

6. An arbor mounting including an arbor shaft, a pair of cylindrical work elements slidably and rotatably mounted on said shaft, said elements being axially adjustable relative to one another while in operative condition, individual driving connections between said shaft and said elements compelling rotation of the elements in unison with the shaft, and means longitudinally adjustable I along said shaft, to effect said relative axial motion of said elements toward and from each other.

References Cited in the file of this patent UNITED STATES PATENTS 431,066 Leverich July 1, 1890 1,223,104 Pickett Apr. 17, 1917 1,618,217 Norton Feb. 22, 1927 1,883,285 Zimmerman Oct. 18, 1932 2,412,419 Palotsee Dec. 10, 1946 2,469,586 Wallace May 10, 1949 FOREIGN PATENTS 468,326 Great Britain- July 2, 1937 749,503 France May 8, 1933 

